package com.atguigu.educenter.controller;

import com.atguigu.commonutils.JwtUtils;
import com.atguigu.config.exceptionhandler.GuliException;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.util.ConstantWxUtils;
import com.atguigu.educenter.util.HttpClientUtils;
import com.google.gson.Gson;
import javassist.bytecode.annotation.EnumMemberValue;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URLEncoder;
import java.util.HashMap;

@CrossOrigin
@Controller  //只请求地址，不返回数据,之前一直返回R.ok()
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    @GetMapping("callback")
    public String callback(String code,String state) {
        try {

            //1、获取code值,临时票据，类似于验证码
            //System.out.println("code:"+code);
            //System.out.println("state:" + state);

            //2、拿着code请求微信固定地址，得到两个值accsess_token 和 openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            //拼接三个参数
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );

            //请求这个拼接好的地址，得到返回的两个值access_token 和 openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);


            //从accessTokenInfo字符串获取出来两个值access_token和openid
            //把accessTokenInfo子串转换成map集合，根据map里面的key获取相应值
            //使用json转换工具
            Gson gson = new Gson();
            HashMap accessTokenMap = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String)accessTokenMap.get("access_token");
            String openid = (String)accessTokenMap.get("openid");

            //自动注册，把扫码人信息添加到数据库
            //判断数据库中是否有重复信息，根据openid
            UcenterMember member = memberService.getOpenIdMember(openid);
            if(member == null) {
                //拿着access_token和openid,再去访问微信提供的固定地址，获取到扫描人信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );

                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //System.out.println("userInfo" + userInfo);

                //获取返回userInfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nikename = (String)userInfoMap.get("nikename");
                String headimgurl = (String)userInfoMap.get("headimgurl");
                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nikename);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }

            //使用JWT根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            //最后返回首页面，通过路径传递token字符串
            return "redirect:http://localhost:3000?token=" + jwtToken;

        } catch (Exception e) {
            throw new GuliException(20001,"登陆失败");
        }
    }

    //生成微信二维码
    @GetMapping("login")
    public String getWxCode() {

        // 微信开放平台授权baseUrl, %s相当于占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl,"UTF-8");
        } catch (Exception e) {
            new GuliException(20001, e.getMessage());
        }

        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );


        //重定向到请求微信地址中去
        return "redirect:" + url;

    }
}
